As mentioned on the Tindie product page, my standard power test is with a 3.7 V, 105 mAH LiPo battery. The LoRaWAN Tx rate is every 10 minutes with GNSS fix @ EPHE < 10 criterion every two hours. This includes sensor reads and all data logged to the SPI flash every minute, but this is a tiny fraction of the power usage. GNSS is highest usage with LoRaWAN a distant second.
Typical LoRaWAN settings are:
LoRaWAN.setSubBand(1); // 1 for MTCAP, 2 for TT gateways
I am not entirely sure I remember off the top of my head since I use these settings as a black box most of the time but I believe the data rate and TxPower are fixed to their lowest settings, which results in SF9 and BW125kHz. All of the power usage tests are done with the asset trackers within 10 meters of the gateway so they do not include the extra Tx power that would be necessary for longer ranges. But as I say, GNSS dominates the power usage in these tests. With similar test set up and LoRaWAN configuration the LoRaSensorTile (no GNSS) uses ~40 uA.
I have not used a LiSOCl2 battery in my power tests yet. And it is true that at least on start up the Asset Tracker power usage can spike well above 100 mA; but it is typically well below this after start up since GNSS and LoRaWAN are rarely ever aligned. So during the normal device run peak currents are typically ~35 mA. But many LiSOCL2 batteries claim 100 mA continuous and 200 mA peak current discharge rates. So while I haven’t tried yet (maybe next on my list of things to do) I relied on the quoted peak current and the quoted 2400 mAH capacity for the longevity estimates.
I do have a very small booster that could serve well with the LiSOCL2 batteries if needed so I doubt it would be a problem to use these batteries even if the power might sag. The booster is a passthrough for any input voltage above 3.6 V and a booster for any input voltage below 3.6 V down to ~1 V. I don’t offer them for sale anymore but I have access to a production line for them and I can always assemble some myself, of course. The very low self-discharge rate compared to standard LiPo batteries makes the LiSOCL2 batteries attractive for battery-powered remote end nodes.
There is at least one 3V3/GND port on the board edge which can be used to connect a power source directly. I would limit this to 3 - 3.3 V sources in general. I can’t remember off the top of my head what the lowest maximum input voltage is for components on these boards. But you could use a 3 - 3.3 V coin cell for example or some other 3.3 V source if you wanted. In this way you could bypass the main LDO.